Fully N-methylated polyaniline was obtained analytically pure by the oxidative polymerization of C6H5N(CH3)(H) with (NH4)2SO8 in 1.0M aqueous HC1. The resulting black-green polymer (sigma approx. .0001 S/cm) was shown by IR studies to have a similar backbone structure to parent polyaniline, and upon heating, lost HC1 and H2O, yielding a black-brown solid, sigma 10 to the 8th S/cm) containing approx. 14% oxidized groups. Pseudo-protonic acid doping of emeraldine base with neat (CH3)2SO4 on the vacuum line yielded polymers whose extent of doping could be monitored continuously. The approx. 50% methylated emeraldine base (sigma approx. .01 S/cm) had XPauli approximately half that of 50% proton doped emeraldine base, consistent with the symmetry-breaking effect of the methyl groups. Emeraldine base prepared in air has been found to have an oxidation state as defined above of (1-y) approx.0.6 whereas when prepared under an inert atmosphere, (1-y) approx.0.4.